98,899 people (2024 Census estimate, +5.6% since 2020)
675 square miles of land · 146 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
14 active community water systems list Benton County in the area they serve, reporting 69,337 people served in all (a system that crosses county lines counts its whole population).
| CORVALLIS, CITY OF surface water · local government · OR4100225 | 61,468 served |
| PHILOMATH PUBLIC WORKS surface water · local government · OR4100624 | 4,670 served |
| ADAIR VILLAGE WATER SYSTEM surface water · local government · OR4100003 | 875 served |
| MONROE, CITY OF surface water · local government · OR4100540 | 723 served |
| KNOLL TERRACE PARK groundwater · private · OR4100174 | 452 served |
| VINEYARD MOUNTAIN WATER groundwater · local government · OR4100231 | 325 served |
| ALSEA COUNTY SERVICE DISTRICT groundwater · local government · OR4100978 | 202 served |
| FIR VIEW WATER COMPANY groundwater · private · OR4100023 | 150 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 46 people were held in Benton County's jail, in Vera's latest figure (2023), or 68 per 100,000 residents ages 15–64. In 2018 it was about 34.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
4 school districts have their office in Benton County. School taxes are usually the largest part of a property tax bill.
Spent $184.6 million — $113 million to run schools, about $17,757 per student, plus $60.5 million on buildings and equipment. Money in: $66.4 million local (mostly property tax), $52.5 million state, $11.6 million federal. Long-term debt: $205.9 million.
Spent $27.9 million — $26 million to run schools, about $16,208 per student, plus $487,000 on buildings and equipment. Money in: $10.5 million local (mostly property tax), $17.9 million state, $1.4 million federal. Long-term debt: $27.6 million.
Spent $11.1 million — $10.7 million to run schools, about $21,020 per student, plus $305,000 on buildings and equipment. Money in: $1.1 million local (mostly property tax), $13.1 million state, $337,000 federal. Long-term debt: $2.1 million.
Spent $7.1 million — $6.4 million to run schools, about $16,698 per student, plus $434,000 on buildings and equipment. Money in: $2.2 million local (mostly property tax), $4.7 million state, $1.2 million federal. Long-term debt: $6.4 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Benton County about $63.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
190 bridges in Benton County: 50 in good condition, 120 fair, and 20 poor (10.5%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| HWY 210 EB over Willamette River · built 1913 | 12,687 vehicles a day |
| OR 34 (Hwy 210) WB over Willamette River · built 1964 | 12,687 vehicles a day |
| NW GRANT ST over DIXON CR · built 1967 | 4,100 vehicles a day |
| NW GARFIELD AVE over DIXON CR · built 1958 | 3,374 vehicles a day |
| E INGRAM ISLAND RD over INGRAM SLOUGH · built 1963 | 469 vehicles a day |
| LLEWELLYN RD over MUDDY CREEK OVERFLOW · built 1959 | 437 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $154.3 million of work in Benton County in fiscal 2025, about $1,621 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for Oregon are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Benton County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Benton County built: brayden.ozark@gmail.com.
More of Oregon: the state government and every county in Oregon.
Nearby counties: Lincoln County (26 mi) · Polk County (28 mi) · Linn County (44 mi) · Lane County (47 mi) · Marion County (50 mi) · Yamhill County (52 mi).